SDL: Support MIN/MAX blend on OpenGL + ES (38697)

SDL Commits
1 
From 38697e832a7754037a81341fd539e173ec37af00 Mon Sep 17 00:00:00 2001
From: ds-sloth <[EMAIL REDACTED]>
Date: Sun, 22 Jan 2023 12:27:52 -0500
Subject: [PATCH] Support MIN/MAX blend on OpenGL + ES

---
 src/render/opengl/SDL_render_gl.c | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/src/render/opengl/SDL_render_gl.c b/src/render/opengl/SDL_render_gl.c
index 9dabc95db494..4b85f0d0b40b 100644
--- a/src/render/opengl/SDL_render_gl.c
+++ b/src/render/opengl/SDL_render_gl.c
@@ -374,6 +374,10 @@ static GLenum GetBlendEquation(SDL_BlendOperation operation)
         return GL_FUNC_SUBTRACT;
     case SDL_BLENDOPERATION_REV_SUBTRACT:
         return GL_FUNC_REVERSE_SUBTRACT;
+    case SDL_BLENDOPERATION_MINIMUM:
+        return GL_MIN;
+    case SDL_BLENDOPERATION_MAXIMUM:
+        return GL_MAX;
     default:
         return GL_INVALID_ENUM;
     }